To better understand the nature of carbon nanotubes supported Co-Mo catalysts （Co-Mo/CNTs） for selective hydrodesulfurization （HDS） of fluid catalytic cracking （FCC） gasoline, studies are carried out using in si...To better understand the nature of carbon nanotubes supported Co-Mo catalysts （Co-Mo/CNTs） for selective hydrodesulfurization （HDS） of fluid catalytic cracking （FCC） gasoline, studies are carried out using in situ Fourier transform infrared spectroscopy （FT-IR）. The catalytic performances of Co-Mo/CNTs catalysts were evaluated with a mixture of cyclohexane, diisobutylene, cyclohexene, 1-octene （60 ： 30 ： 5 ： 5, volume ratio） and thiophene （0.5%, ratio of total weight） as model compounds to simulate FCC gasoline. The HDS experimental results suggested that the HDS activity and selectivity of Co-Mo/CNTs catalysts were affected by Co/Mo ratio; the optimal Co/Mo atomic ratio is about 0.4, and the optimum reaction temperature is 260 ℃. The in situ FT-IR studies revealed that 1-octene can be completely saturated at 200 ℃. In the FT-IR spectra of diisobutylene, the characteristic absorption peak around 3081 cm^-1 for the stretching vibration peak of =C-H bond was still clear at 320 ℃ indicating that diisobutylene is difficult to be hydrogenated. As for the thiophene, no characteristic absorption peak could be found around 3092 cm^-1 and 835 cm^-1 when the reaction temperature was raised to 280 ℃, indicating that thiophene had been completely hydrodesulfurized. On the basis of FT-IR results, it can be deduced that thiophene HDS reaction occurred mainly through direct hydrogenolysis route, whereas thiophene HDS and diisobutylene hydrogenation reaction over Co-Mo/CNTs catalysts might occur on two different kinds of active sites.展开更多
This articles refers to the development of the technology for hydrodesulfurization (HDS) and aromatization of FCC naphtha This technology adopts a catalyst with aromatization performance, which does not reduce the oct...This articles refers to the development of the technology for hydrodesulfurization (HDS) and aromatization of FCC naphtha This technology adopts a catalyst with aromatization performance, which does not reduce the octane rating of gasoline in the course of HDS of FCC naphtha. Experimental results have shown that the sulfur removal rate of FCC naphtha could reach over 85%, with the RON of gasoline increased by 0.2-0.6 units, the MON increased by 1.3-1.8 units and the antiknock index of the gasoline increased by around one unit. The total C5+ liquid yield was over 95%. The activity of regenerated catalyst could be restored to be equal to that of fresh one after coke burning on the spent catalyst.展开更多
基金National Basic Research Program of China ("973"Program,No.2004CB217807)
文摘To better understand the nature of carbon nanotubes supported Co-Mo catalysts （Co-Mo/CNTs） for selective hydrodesulfurization （HDS） of fluid catalytic cracking （FCC） gasoline, studies are carried out using in situ Fourier transform infrared spectroscopy （FT-IR）. The catalytic performances of Co-Mo/CNTs catalysts were evaluated with a mixture of cyclohexane, diisobutylene, cyclohexene, 1-octene （60 ： 30 ： 5 ： 5, volume ratio） and thiophene （0.5%, ratio of total weight） as model compounds to simulate FCC gasoline. The HDS experimental results suggested that the HDS activity and selectivity of Co-Mo/CNTs catalysts were affected by Co/Mo ratio; the optimal Co/Mo atomic ratio is about 0.4, and the optimum reaction temperature is 260 ℃. The in situ FT-IR studies revealed that 1-octene can be completely saturated at 200 ℃. In the FT-IR spectra of diisobutylene, the characteristic absorption peak around 3081 cm^-1 for the stretching vibration peak of =C-H bond was still clear at 320 ℃ indicating that diisobutylene is difficult to be hydrogenated. As for the thiophene, no characteristic absorption peak could be found around 3092 cm^-1 and 835 cm^-1 when the reaction temperature was raised to 280 ℃, indicating that thiophene had been completely hydrodesulfurized. On the basis of FT-IR results, it can be deduced that thiophene HDS reaction occurred mainly through direct hydrogenolysis route, whereas thiophene HDS and diisobutylene hydrogenation reaction over Co-Mo/CNTs catalysts might occur on two different kinds of active sites.
文摘This articles refers to the development of the technology for hydrodesulfurization (HDS) and aromatization of FCC naphtha This technology adopts a catalyst with aromatization performance, which does not reduce the octane rating of gasoline in the course of HDS of FCC naphtha. Experimental results have shown that the sulfur removal rate of FCC naphtha could reach over 85%, with the RON of gasoline increased by 0.2-0.6 units, the MON increased by 1.3-1.8 units and the antiknock index of the gasoline increased by around one unit. The total C5+ liquid yield was over 95%. The activity of regenerated catalyst could be restored to be equal to that of fresh one after coke burning on the spent catalyst.
